Dyeing process.



UNITED s'rn'rns n rnnr onnrcn- JUAN AliTIBAL DOMINGUEZ, 0F .BUENOS AIRES, ARGENTINA.

DYEING PROCESS.

Patented 1912. Serial No. 693,724.

Specification of Letters Patent. Application filed April 27,

No Drawing.

To all whom it Be it known may concern:

that I, JUAN ANIBAL Don/rm combines with tannic acid. and catechin of ennz, a citizen 0 Argentina, residing at the algarroba. Buenos Aires, Argentina, have invente a The great value of this discovery for innew and useful Dyeing Process, of which dustrial purposes rests in this-that textiles obtain thereby a maximum of color value with a minimum of applied coloring matter after they have been treated in a solution of the kinos of the algarroba. It has also been foundthat by the application of this method the weight of the textile material is greatly increased. This increase in weight also takes place when the textile (especially silk is treated with catechu, and is immersed a terward in a solution of iron and zinc sa The increase by wei ht of this treatment amount-s to 197.5 to 18.?1%. If, however, the same material is treated in a solution 0 kinos of the algarroba and is subjectedto the following is a specification.

This invention relates to a method for utilizing the exudations of certain plants as a fixing means for dyes.

One object of the invention is to provide a method by means of which the kinos of the white and black algarroba (Prosogn's alba and Prosom's nigra.) and the extracts of said kinos may be used for fixing artificial coloring matter to textile fabrics.

Other objects will be more clearly understood by reference to the following speci cation and appended claims,

In a prior application, for U. S. Letters Patent, filed October 9, 1911, Serial No. the treatment m a solution of iron and zinc. 653,737, I have pointed out that the exudasalts afterward the increase in weight will tions of the white and black algarroba (Pr'oamount to from 24: to 24.31%.

some alba and Prosopcsm'gm) have the same tannic and astringent qualities as the exudations usually designated by catechu, kinos or gambier respectively. The extracts of the kino of the algarroba contain about 30% of tannic acid and 38% of catechin. They, therefore, are not only adapted to form the bases for coloring matter and to produce various tints by adding chemical ingredients thereto; but they are also adapted for the purpose of fixing dyes primarily applied to various objects. These dyes ma e well In the following various examples are given for utilizing the extracts of the algarroba (Prosopis alba and Prosop'is nigm) as a fixing means for dye stuflis. These examples apply to the treatment of cotton fibers,although they may be used in connection with other textile material when suitable alterations of the method are applied.

For fixing malachite'green in cotton the textile is immersed in a bath containing a 12 solution of the kino of the algarroba. Ihe textile is then dried known artificial coloring bases, like fuchsin, transferred to a bath containing pyrolignite malachite green or the like. oi iron at 3 Baume. The material 18 washed and dyed in malachite green, the solution being in the meanwhile slowly heated to the boiling point. dyed the material is washed in a weak solution of soap and water.

For fixing that coloring matter in cotton which comes on the market under the name of Femilene gray the material is placed into a bath containing a 10% solution of the kino of the algarroba and is then transferre after having been dried by wringing out, to a 3% bath of tartar emetic or acetate of aluminium. It is again The exudation insoluble compound with alumina or with metal oxide, and these compounds also serve as fixing means for coloring matters of acid qualities, like alizarin, etc. It will be seen, therefore, that the extracts of the algarroba are notonly o substantial value as coloring matter, but also as a fixing means for other coloring matters. The reactions vhich take place are based on the combination of thercoloringniatter like fuchsin with the tannic acid an the catechin of the algarroba extracts. The result is, therefore, a colored pigment. In these so a combination takes re-actions val place between the coloring basis and an oxid dried, washed and finally the dye is applied in a solution at a temperature 0 by wringing out and After having been;

which is precipitatedin the textile and which 1. A method of dyeing material which or Proaopz'sm'gm) Washing the material'and Consists in treating the material to be dyed then applying the coloring solution thereto. in extracts of algarroba trees (Prosopz's alba n testimony whereof I afiix my signature 5 and Brpsopispiqm), and the r applying the in presence of two witnesses.

dye material in form of bases or acids. JUANJANIBAL-DOMINGUEZ.. A method of fixing dye stuffs in textile W itnesse's: 1 materials which consists in immersing the Jos A. GINTIAN, material to be treated in a bath containing Amer G-*:EEERT. copies of this patent may be obtained .for five ge ggph, by addressing the Commissioner of Patents vr: Y W SI iMIQnMDi- Q I claim: an extract of the algarroba (Pmsopz's alba 10" 

